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Leap second support

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Leap second status is accepted and forwarded to clients if majority
of selectable sources agree. The actual insertion/deletion is supported
only on Linux now.
This commit is contained in:
Miroslav Lichvar
2008-12-31 09:59:20 +01:00
parent 0148ecaea0
commit 8f9c237010
13 changed files with 141 additions and 12 deletions
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51
reference.c
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@@ -44,6 +44,7 @@ static int are_we_synchronised;
static int enable_local_stratum;
static int local_stratum;
static NTP_Leap our_leap_status;
static int our_leap_sec;
static int our_stratum;
static unsigned long our_ref_id;
struct timeval our_ref_time; /* Stored relative to reference, NOT local time */
@@ -102,7 +103,8 @@ REF_Initialise(void)
double our_frequency_ppm;
are_we_synchronised = 0;
our_leap_status = LEAP_Normal;
our_leap_status = LEAP_Unsynchronised;
our_leap_sec = 0;
initialised = 1;
our_root_dispersion = 1.0;
our_root_delay = 1.0;
@@ -176,6 +178,10 @@ REF_Initialise(void)
void
REF_Finalise(void)
{
if (our_leap_sec) {
LCL_SetLeap(0);
}
if (logfile) {
fclose(logfile);
}
@@ -311,6 +317,44 @@ maybe_log_offset(double offset)
/* ================================================== */
static void
update_leap_status(NTP_Leap leap)
{
time_t now;
struct tm stm;
int leap_sec;
leap_sec = 0;
if (leap == LEAP_InsertSecond || leap == LEAP_DeleteSecond) {
/* Insert/delete leap second only on June 30 or December 31
and in other months ignore the leap status completely */
now = time(NULL);
stm = *gmtime(&now);
if (stm.tm_mon != 5 && stm.tm_mon != 11) {
leap = LEAP_Normal;
} else if ((stm.tm_mon == 5 && stm.tm_mday == 30) ||
(stm.tm_mon == 11 && stm.tm_mday == 31)) {
if (leap == LEAP_InsertSecond) {
leap_sec = 1;
} else {
leap_sec = -1;
}
}
}
if (leap_sec != our_leap_sec) {
LCL_SetLeap(leap_sec);
our_leap_sec = leap_sec;
}
our_leap_status = leap;
}
/* ================================================== */
void
REF_SetReference(int stratum,
@@ -356,13 +400,14 @@ REF_SetReference(int stratum,
are_we_synchronised = 1;
our_stratum = stratum + 1;
our_leap_status = leap;
our_ref_id = ref_id;
our_ref_time = *ref_time;
our_offset = offset;
our_root_delay = root_delay;
our_root_dispersion = root_dispersion;
update_leap_status(leap);
/* Eliminate updates that are based on totally unreliable frequency
information */
@@ -517,6 +562,8 @@ REF_SetUnsynchronised(void)
}
are_we_synchronised = 0;
update_leap_status(LEAP_Unsynchronised);
}
/* ================================================== */